STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2020

STOCK-BASED COMPENSATION

Summary of stock option activity

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
	Number of	Exercise		Contractual	Intrinsic Value
	Shares	Price		Term (years)	(in millions)
Outstanding and exercisable, December 31, 2019	10,834	$	18.59
Exercised	10,834		18.59
Outstanding and exercisable, June 30, 2020	—	$	—	—	$	—

Summary of restricted stock activity

		Weighted
	Number of	Average Grant
	Shares	Date Fair Value
Nonvested stock at December 31, 2019	436,013	$	92.47
Granted	183,731		117.43
Vested	(268,187)		88.07
Forfeited	(11,080)		105.47
Nonvested stock at June 30, 2020	340,477	$	108.98

Summary of performance-based restricted stock unit

		Weighted
	Number of	Average Grant
	Shares	Date Fair Value
Nonvested stock at December 31, 2019	132,248	$	105.75
Granted	72,975		125.62
Vested	(48,053)		108.91
Forfeited	(34,504)		109.85
Nonvested stock at June 30, 2020	122,666	$	115.18